Logarithm Calculator
log_base(value), plus ln and log10 of the same value. Value must be positive.
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How to use Logarithm Calculator
- Enter value, base. Leave a field blank only when the page says the value is missing.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Rounding follows IEEE floating point in this browser unless the page says it uses integers or BigInt.
Logarithm Calculator
Arbitrary base
| Computes | log_base(value), plus ln and log10 of the same value. Value must be positive. |
|---|---|
| Includes | Arbitrary base |
| Includes | ln and log10 |
| Engine | scientific |
| Upload | None |
| Advice | Arithmetic only |
What Logarithm Calculator is
log_b(x) = ln(x)/ln(b). Base 10 of 1000 is 3. Base e is ln. Base 1 and non-positive bases are rejected.
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
Powers are the inverse on exponent. The scientific page accepts log and ln in an expression.
Entities and related jobs
log_base(value), plus ln and log10 of the same value. Value must be positive. Named features: Arbitrary base, ln and log10.
See also Exponent Calculator, Nth Root Calculator, Scientific Calculator, Percentage Calculator, Fraction Calculator, GCD Calculator.
Use cases
pH-style logs, decibels you compute yourself, and change-of-base homework.
Limits
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.